Humanoid Sound Systems is the author of the Scanned Synth Pro 2 synthesizer, it's synthesis method is rather unique an is called scanned synthesis.
The default gui is tabbed and uses pages for each section of the synth such as synthesis,modulations and effects. I have made a one-page gui where everything is available in one single page, this is also the reason the gui is more compact and has slightly smaller knobs than the default.
Give them a whirl.
One skin - preview image
Brownie skin - preview image
Military skin - preview image